90Sr/Y beta continuum from 4 year old source

[Geoff]

I had an opportunity to buy a four year old .1 uCi 90Sr source (90% of the original isotope still exists) for half the cost of a new one. I didn't NEED it, but seeing as I didn't have a pure beta emitter I figured I'd buy it.

Here is a ten hour spectrum I collected after it arrived. I'm experimenting with my low energy detector to see what kind of x-rays I can see from different attenuators.